Population projections provide estimates of the size of the future population, and are based on assumptions about births, deaths and migration. The assumptions are based on past trends. Projections only indicate what may happen should the recent trends continue. Projections done in this way do not make allowances for the effects of local or central government policies on future population levels, distribution and change.
Population projections can be used for business, planning, and education. In addition to predicting the growth of a particular area, population projections can allow you to extrapolate current trends into the future. The Planners Package provides demographic data from the 1980s to the present, and also offers detailed population and housing projections through 2010.